THEORY OF OPERATION
V1
V2
V3
WDI
V4
WDI
OSC
LOGIC
Bandgap
Ref
1.25V
CONTROL
LOGIC
RSTB (RST)
0.5V
MRIB
GND
Block Diagram
The SP6330, SP6332, and SP6334 include
a low-voltage precision bandgap reference,
four precision comparators, an oscillator, a
digital counter chain, a logic control block,
trimmed resistor divider chains and
additionalsupportingcircuitry. Thefamilyis
designed to supervise up to 4 independent
supply voltages. V1 and V2 supply inputs
have their resistor dividers on the chip.
Their trip thresholds are factory trimmed.
V3 and V4 inputs allow user to customize
two additional supply thresholds to be
monitored by means of external resistor
dividers. The devices also feature manual
reset and watchdog functionalities.
As these devices do not have watchdog
outputs, the watchdog timer is serviced
internally during the watchdog timeout
period when WDI is left unconnected. The
watchdog functionality can be disabled by
leaving the WDI input floating.
Nov20-06 Rev M
SP6330/32/34 Quad Power Supervisory Circuit Family
© Copyright 2006 Sipex Corporation
6
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